agp/intel-gtt: export the gtt pagetable iomapping

We need this because ppgtt page directory entries need to be in the
global gtt pagetable.

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 0a305acb0374..5cf47ac2d401 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -680,6 +680,7 @@ static int intel_gtt_init(void)
                 iounmap(intel_private.registers);
                 return -ENOMEM;
         }
+        intel_private.base.gtt = intel_private.gtt;
 
         global_cache_flush();   /* FIXME: ? */
 
diff --git a/include/drm/intel-gtt.h b/include/drm/intel-gtt.h
index 6d4c77ac7d76..0a0001b9dc78 100644
--- a/include/drm/intel-gtt.h
+++ b/include/drm/intel-gtt.h
@@ -17,6 +17,8 @@ const struct intel_gtt {
         unsigned int do_idle_maps : 1;
         /* Share the scratch page dma with ppgtts. */
         dma_addr_t scratch_page_dma;
+        /* for ppgtt PDE access */
+        u32 __iomem *gtt;
 } *intel_gtt_get(void);
 
 void intel_gtt_chipset_flush(void);